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GNU IceCat
GNU IceCat is the GNU version of the Firefox browser.

For the mobile variant of IceCat, see IceCatMobile.

GNU IceCat (originally GNU IceWeasel) is part of GNUzilla (the GNU version of the Mozilla Application Suite). GNU IceCat aim to be based on the the current official release of Firefox Extended Support Release (ESR) with removal of trademarked artwork and proprietary components.

However, IceCat is not a straight fork of Firefox ESR; instead, it is a parallel effort that works closely with and re-bases in synchronization on the latest Firefox ESR as the upstream supplier, with patches merged upstream whenever possible; although it should be noted that additional security updates are customized to IceCat occasionally.

Another important difference between Mozilla's Firefox and GNU IceCat is that IceCat has a focus on freedom and privacy, such that it is designed to make it easy for the user to: block execution of non-free JavaScript with GNU LibreJS or disable all JS, block privacy trackers with SpyBlock (Adblock Plus fork), get redirected to HTTPS when possible with HTTPS Everywhere, and more!

And lastly, whereas new versions of Firefox are being created such that they support Digital Restrictions Management systems through their implementation of the Encrypted Media Extension, GNU IceCat will not include an EME implementation as it opposes efforts to popularize and ease the dissemination of DRM technology and related proprietary software.

GNU IceCat was formerly known as GNU IceWeasel but changed its name to avoid confusion with the now defunct Debian IceWeasel who had the name first.


Community driven manuals are available at

"IRC [] " IRC general channel

Related Projects

Extensions, plug-ins, or add-ons for this program

Adblock Plus (ABP)Ad blocker
All-In-One SidebarAiOS lets you open various windows as sidebar panels, and quickly switch between them. So it put an end to the window chaos! In addition to bookmarks and history it opens dialogues such as downloads, add-ons and more in the sidebar.
BlenderBlend in the crowd by faking to be the most common Firefox browser version, operating system and other stuff.
ChatZillaA clean, easy to use and highly extensible Internet Relay Chat (IRC) client.
Clear ConsoleOne click button to clear IceCat browser data.
ClickGuardPrevent accidental interaction with tab contents
Cookie Monstermakes it very easy to manage cookies in a whitelist-based way
DactylVim-inspired, keyboard-accessible user interface for Iceweasel/Firefox
Disable DHEDisables ephemeral Diffie-Hellman cipher suites that are vulnerable to the logjam attack.
Disable Speculative Pre-connectionsHide in the forest, with speculative pre-connections cleanly disabled.
Disable VisitedLinksThis plugin cleanly disables visited link styles.
Disable WebRTCWebRTC exposes your internal network IP(s), without user interaction.
DisconnectDisconnect lets you visualize and block the otherwise invisible websites that track your search and browsing history.
DuckDuckGo (non-JS Lite SSL)This extension adds DuckDuckGo (non-JS Lite version) to the search bar.
DuckDuckGo (non-JS SSL)This extension adds DuckDuckGo (non-JS HTML version) to the search bar.
Fat-Free FoxBrowser extension to reduce the amount of private information your browser shares
FlashgotExtension to handle downloads with external download managers
Free Proxy ListProxyList" helps users to use proxies from Proxy List site.[ ]
Google search link fixThis extension prevents Google and Yandex search pages from modifying search result links when you click them. This is useful when copying links but it also helps privacy by preventing the search engines from recording your clicks.
GoogleTranslateAutomatically translate from any language to your language.
GreasemonkeyLocally change the way a page looks or works using javascript.
HTML5 Video Everywhere!Replace video player with native HTML5 video player
NO Google AnalyticsActively blocks Google Analytics from running on your Firefox, manually stopping the website you visit from tracking you!
No Resource URI LeakDeny resource:// access to Web content: We fill the hole to defend against fingerprinting. Very important to Firefox privacy. A direct workaround for
NoScriptOnly enable JavaScript for sites you trust.
Privacy BadgerBrowser extension that detects and prevents third-party tracking
QuickJavaAllows quick enable and disable of Java, Javascript, Cookies, Image Animations, Flash, Silverlight, Images, Stylesheets and Proxy from the Toolbar. This is great for increasing security or decreasing bandwidth.
RECAPRECAP The Law for Better Access to Public Court Records.
Self-Destructing CookiesFix the web. Gets rid of a site's cookies and LocalStorage as soon as you close its tabs. Protects against trackers and zombie-cookies. Trustworthy services can be whitelisted.
Startpage (SSL)This search bar add-on utilizes SSL to protect searches between You and Startpage.
StylishRestyle the web with Stylish, a user styles manager. Stylish lets you easily install themes and skins for Google, Facebook, YouTube, Orkut, and many, many other sites. You can even customize Firefox and other programs themselves.
Toggle Cipher SuitesThis firefox addon provides a quick way to enable or disable various ssl3 cipher suites used in the browser.
Tree Style TabTree-stlye tabs for Gnuzilla IceCat
UnplugA video download tool which lets you save video and audio which is embedded on a webpage.
VimperatorIceCat extension to make it have vim look and feel
WappalyzerWappalyzer is a browser extension that uncovers the technologies used on websites. It detects content management systems, eCommerce platforms, web servers, JavaScript frameworks, analytics tools and many more.
Weather Underground (Forecast Plus)Provides local & long range Weather Forecast using Weather Underground
Wikileaks SearchThis addon simply allows you to search the archives of Wikileaks
Wikipedia (SSL)Wikipedia is an openly-editable, free content internet encyclopedia. This search bar add-on utilizes SSL to protect searches between You and Wikipedia.
YouTube All HTML5Play almost any video on YouTube and many videos on Vimeo as a HTML5 video
Zombie NavigatorAutomate any web workflow simply with IceCat. It's kind of SlimerJS as an IceCat addon. Lightweight and unintrusive.
Zoom PageFull featured zoom manager with independent page and image zoom modes.
Zoom Page WEZoom web pages either per-site or per-tab, with optional fit-to-width and minimum text size, using the toolbar button, context menu, keyboard shortcuts or mouse wheel.
uBlock Origin (uBO)A wide-spectrum blocker. Easy on CPU and memory.
uMatrixPoint & click to forbid/allow any class of requests made by your browser. Use it to block scripts, iframes, ads, facebook, etc.


LicenseVerified byVerified onNotes
License:GPLDavid Hedlund12 July 2015
"Because we hope and want our privacy enhancements to be picked up by Mozilla itself, we are keeping the same tri-licensing scheme for Gnuzilla/IceCat as GNU uses: MPL/GPL/LGPL." - README.IceCat
License:LGPLDavid Hedlund12 July 2015
"Because we hope and want our privacy enhancements to be picked up by Mozilla itself, we are keeping the same tri-licensing scheme for Gnuzilla/IceCat as GNU uses: MPL/GPL/LGPL." - README.IceCat
License:MPLDavid Hedlund15 August 2015
"Because we hope and want our privacy enhancements to be picked up by Mozilla itself, we are keeping the same tri-licensing scheme for Gnuzilla/IceCat as GNU uses: MPL/GPL/LGPL." - README.IceCat
License:MPLv2.0David Hedlund5 October 2016
"Binaries of this product have been made available to you by the GNU Project under the Mozilla Public License 2.0 (MPL)." - Help -> About IceCat

Leaders and contributors

Rubén Rodríguez Maintainer
David Hedlund (David Hedlund)Add-on repository maintainer

Resources and communication

AudienceResource typeURI
Security AdvisoriesBug Tracking
User manual pagesForum
FTP archiveDownload
Software development management systemDeveloper
bug-gnuzilla -- GNUzilla discussion and bug reports.Mailing List
Windows users - No official releaseDownload
General usersGeneral
bug-gnuzilla -- GNUzilla discussion and bug reports.Bug Tracking
BugsBug Tracking
bug-gnuzilla -- GNUzilla discussion and bug
Website bugs for Firefox ESR and GNU IceCatBug Tracking
DeveloperVCS Repository Webview

Software prerequisites

This entry (in part or in whole) was last reviewed on 16 April 2017.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.